package cnf

import (
	lib "github.com/go-ini/ini"
	"io"
	"io/ioutil"
	"strings"
)

type ini struct {
	sections []string
	data     *lib.File
	parsed   bool
}

// ReadFrom implements io.ReaderFrom
func (d *ini) ReadFrom(_reader io.Reader) (int64, error) {

	// disallow "key: value"
	// when trying to find out the format from content
	// and avoids conflicts with YAML
	opts := lib.LoadOptions{
		KeyValueDelimiters: "=",
	}

	file, err := lib.LoadSources(opts, ioutil.NopCloser(_reader))
	// 1. get json decoder
	if err != nil {
		return 0, err
	}

	d.data = file
	d.sections = file.SectionStrings()
	d.parsed = true
	return 0, nil

}

// WriteTo implements io.WriterTo
func (d *ini) WriteTo(_writer io.Writer) (int64, error) {
	return d.data.WriteTo(_writer)
}

// Get returns the value of a dot-separated path, and if it exists
// the maximum depth is 2 : Section.Field
func (d *ini) Get(_path string) (string, bool) {

	// 1. split path
	path := strings.Split(_path, ".")

	// 2. fail if too long
	if len(path) > 2 {
		return "", false
	}

	// 3. direct field (no section)
	if len(path) == 1 {
		// unknown field
		if !d.data.Section("").Haskey(path[0]) {
			return "", false
		}

		// found
		return d.data.Section("").Key(path[0]).String(), true
	}

	// 4. fail on missing section
	found := false
	for _, sec := range d.sections {
		if sec == path[0] {
			found = true
			break
		}
	}
	if !found {
		return "", false
	}

	// 5. Fail on unknown field
	if !d.data.Section(path[0]).HasKey(path[1]) {
		return "", false
	}

	// 6. return value
	return d.data.Section(path[0]).Key(path[1]).String(), true

}

// Set the value of a dot-separated path, and creates it if not found
func (d *ini) Set(_path, _value string) bool {

	// 1. split path
	path := strings.Split(_path, ".")

	// 2. fail if too long
	if len(path) > 2 {
		return false
	}

	// 3. direct field (no section)
	section, field := "", path[0]
	if len(path) > 1 {
		section, field = path[0], path[1]
	}

	// 4. Set field value
	d.data.Section(section).Key(field).SetValue(_value)
	return true

}